Lapping-in tool for internal-combustion engines



H. W. STIMSON LAPPING-IN TOOL FOR INTERNAL COMBUSTION ENGINES March 18 1924.

Filed Oct. 2. 1922 Patented Mar. 18, 1924.

UNITED STATES HABRY W. STIHSON, OF WEST ALLIS, WISCONSIN.

LAPPING-IN TOOIIFOR INTERNAL-COMBUSTION ENGINES.

Applicatfpn flled October 2, 1922. Serial No. 591,893.

To all whom it may concern:

Be it known that I, HARRY W. S'rmson', a citizen of the United States, and resident of West Allis, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Lapping-In Tools for- Internal-Combustion E nes, of which the following, is a descriptlon, reference' being had to the accompanyin drawings, which are a part of this speci cation.

This invention relates to'a lappin -in tool for internal combustion engines. ools of this character are used. for grindin and polishing the inner surfaces of a cy inder so that the piston will fit properly.

It is an object of this invention to provide a structure of this type wherein the lapping tools may be quick y and easily adjusted and readily secured in their adjusted positions.

A lapping-in tool constructed in accordance wlth this. invention has also the added advantages that slight adjustments may be made with facility and the lapping tools easily released so that the device may be withdrawn from the cylinder.

' p The invention further consists in the novel combination, construction and arrangement of parts wherein the objects of this invention are efficiently accomplished. The in vention will be described in detail in the i accoin anying specification when considered with t eaccompanying drawings wherein:

Figure 1 is an elevational sectional view throu h a lapping-in tool constructed in acco ance with this invention; and,

Fig. 2 is a sectional view, dpartly broken away, taken on the plane in icated by the line 2--2 in Fig. 1.

Referring now more particularly to the drawings wherein like reference characters indicate like parts, it will be noted that the device consists essentially of a shaft 10 provided at one end thereof with a collar member 11 towhich there is pivotally secured a plurality of link members 12. Pivotally secured to iiach linli meilmber ale; at 113, is a la 'i too 14,a ura'tyo t ese appin to ls b eing employ 'bd, as clearly illustrated in Fi 2. v

Dis%laceable longitudinall of the shaft 10 is a bevelled collar 15, the velled surface it of which is, ada ted to engage the inner ends 17 of. the lin members 12 so that as the collar 15 is moved toward the inner end of the shaft 10, the lapping tools 14; will be expanded outwardly to increase the diamet'er of the lapping tool.

The collar 15 is operated by means-of a sleeve 18 which surrounds the shaft 10 and is rigidly connected to the bevelled collar 15 at one end, and is provided at its outer end with a plurality of spring actuated dogs 19, pivoted thereto as at 20. Each dog 19 15 provided at one end with a plurality of saw teeth 21, which in turn are adapted to engage with a threaded portion of a sleeve 22 mounted on the shaft 10. The abrupt faces of the saw teeth. 21 are so disposed that accidental movement of the sleeve 18, and consequently of the bevelled member 15, away from the lapping tools 14 is prevented but adjustment of the bevelled member 15 toward the lapping tools is permitted.

Loosely surrounding the sleeve 18 is a collar 23 provided on one of its edges with a bevelled recess 24 adapted to e age the bevelled ends 25 of the dogs 19. O viously by displacing the collar 23 toward the dogs 19, the engagement of the bevelled surfaces 24 and 25 will lift the saw teeth 21 of each dog from' engagement with the threads of the sleeve 22, whereu on'the sleeve 18, together. with the beveled collar 15 may be readily moved along the shaft 10. This ar rangement is rovided so that a large adjustment may upon the lappin lieved, so that t e tool may be withdrawn from the interior of the cylinder.'

Mounted also on the. shaft 10 is a sleeve 26, this sleeve being prevented from longitudinal displacement relative to the shaft 10 b means of two collars, 27 and 28, both fixe to the shaft 10. This sleeve 26 has a threaded engagement with the sleeve 22 so that by rotating this sleeve, the bevelled collar 15 may be adjusted longitudinally to adjust the tension of the spring 29.

The coiled spring 29 which yieldingly holds the parts in a justed positions is isposed within the sleeve 18. A guide plate 30, fits loosely on the shaft 10 and acts as a stop to gauge the distance the tool is fed. in

- the cylinder. A collar 31 fixed on the shaft 10, supports. the tool with respect to the late. Obviously, any suitable means may he provided for rotating the shaft 10 during the use of the tool. It is-un'derstood that in lapping the cylinder, the lappingquickly made, or pressure tools 14 immediately remembers .14 are provided with a lapping compound which is in the nature of an abrading material. It is further understood that the lapping members 14 can be charged with an abrasive thereby eliminatinglapping compounds.

From the foregoing it will be immediately apparent, that there is herewith described and illustrated a lapping-in tool which may be quickly and easily adjusted to the desired size, and which is furthermore capable of minute adjustments. Means are provided for maintaining the parts in their adjusted positions and ofquickly releasing the lapping members so that the tool may be wit drawn from the interior of the cylinder.

The arrangement of the parts is such that a tool ccnstructed in accordance with this invention may be cheaply and durably manufactured and liability of the same becoming broken is reduced to a minimum.

While one specific embodiment of the in vention is described and illustrated herein, it is not intended that this invention be unnecessarily limited, but reservation is made to make such changes and modifications as may come within the purview of the accompanying claims.

Having thus described the invention what is claimed is:

Claims:

1. In a tool of the class described, a plurality of lapping members, axially displace- ,able means including releasable dogs for radially'dispacing said members and means 'p for releasing said dogs.

'displaceable relative thereto sai ing adapted to displace said displacing the same radially, means includ-' in a plurality of dogs for adjusting said co lar and for securing said bollar in its adjiusted position and means for releasing said i In, a lapping-in tool for internal combustion en ines, a shaft adapted to be rotated, .a p urality of lapping in members pivotall mounted on said shaft, a collar mounts on said shaft and Ion itudinally collar belapping members, means embodying a plurality of spring actuated dogs for displacing said collar and forsecuring said collar is its adjusted posibe free tion and additional means for providing limited adjustment of said collar.

5. In a lapping-in tool for internal combustion engines, a shaft adapted to be rotated, a plurality of lapping-in members pivotally mounted on said shaft, a collar mounted on said shaft and longitudinally displaceable relative thereto, said collar being adapted to displace said lappin members, means embodying a plurality o sprin actuated dogs for displacing said collar an for securing said collar in its adjusted position, additional means for providing limited adjustment of said collar and means for simultaneously releasing said spring dogs.

6. In a lapping-in tool of the class described, a shaft, a plurality of lapping members, links for pivotally securing said lapping members to said shaft, a sleeve longitudinalli displaceable along said shaft,

a collar provided with a bevelled surface secured to said sleeve at one end thereof and adapted to enga e said links for radially displacing said apping members, a lurality of spring actuated dogs mounte on the other end of said sleeve and a second sleeve mounted on said shaft and provided with threads adapted to be engaged by said dogs whereby said bevelled collar may moved in the direction in which it radia ly displaces said lapping members.

7. In a lapping-in tool of the class. described, a shaft, a plurality of lapping members, links for pivotally securing said lapin members to said shaft,.a sleeve longitudinally displaceable along said shaft, a collar rovided with a bevelled surface secured to said sleeve at one end thereof and adapted to en a c said links for radially I displacing sai apping members, a plurality of spring actuated dogs mounted on the other end of said sleeve, 8. second sleeve provided with a threaded portion mounted on said shaft, said dogs bein provided with saw teeth for engagement wit said threaded portion whereby said first mentioned sleeve and collar may be freely moved in one direction and means engaging said second sleeve for further longitudinally adjusting said collar.

8. In a lapping-in tool of the class described, a shaft, a plurality of lapping members, links for pivotally securin said lapping members to said shaft, a s eeve longitudinally displaoeable along said shaft, a collar provided with a bevelled surface se-v cured to said sleeve at one end thereof and adapted to en age said links for radially displacing sai lapping members, a "luralityof spring actuated dogs moan on the other end of said sleeve, 9. second sleeve provided with a threaded portion mounted on said shaft, said dogs being provided with saw teeth for engagement with said 7 threaded portion whereby .said first men- III tioned sleeve and collar may be freely moved in one direction and means for s1- multaneously releasing said do 9. In a lapping-in tool for lnternal combastion engines, a rotatable shaft, a plurality, of lappingin members secured to said shaft, means for radially adjusting said 1apping in members, a guide plate for said rotatable shaft and a stop =carried by said shaft and adapted to engage said plate to limit the movement of said tool into the engine cylinder.

10. The combination with a lapping-in tool of the class described including a rotatable shaft adapted to be inserted into the cylinder of an engine of a guide p late engaging the open end of the cylinder being ground for guidingly supporting said shaft and a stop adjustably secured to said shaft and engaging saidplate for limiting the extent to which said tool may be inserted into the cylinder.

In testimony whereof, I aflix my signature.

HARRY W. STIMSON. 

